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2.0 TDI fuel consumption

Discussion in 'A3/S3/Sportback (8P Chassis)' started by john_e, Feb 10, 2014.

  1. john_e
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    john_e New Member

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    [Feb 10, 2014]
    I recently traded my '05 2.0 TDI (140) SE manual for a '08 2.0 TDI (140) S Line s-tronic. The car was serviced and had the belt changed before I picked it up. I'm doing the same daily drive (in the same style) I was doing before but I'm finding the fuel consumption to be brutal. According to the DIS I've averaged mid-40s MPG on each journey since I last filled up yet with the needle on just over half I've only done 200 miles. In my old A3 I'd have done 200 miles on a quarter of a tank.


    The car is due a gearbox service but I can't think of anything that could be causing such poor fuel consumption. As far as I know it's not modded.


    Just wondered whether other owners of similar cars are getting similar figures? My daily commute is a mix of town traffic and a 8-10 mile dual carriage way stretch.


    Also, is there a way to stop the DIS resetting the average fuel consumption back to zero randomly? The car's manual doesn't cover the DIS.
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    [Dec 19, 2014]

  3. a3Tex
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    a3Tex New Member

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    [Feb 10, 2014]
    800 miles to a tank?

    Maybe you're just taking less class A's now?
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  4. john_e
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    john_e New Member

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    [Feb 10, 2014]
    Class A's?!?! Not likely with the amount of money I'm spending on diesel these days. As per most cars, the gauge takes a while to move and then moves quicker. I'd do 200 miles to a quarter then be on around 425-450 when I had a quarter left.
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  5. c_w
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    c_w Well-Known Member

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    [Feb 10, 2014]
    Where does he say he gets 800miles to a tank? My fuel usage usually shows 200miles when it hits 3/4. Not that it gets 800miles as the gauge isn't linear.

    It is plausible that the timing isn't quite right since the cambelt was recently changed.

    But, as it's a new car to you, you're better brimming the tank, driving for 200miles or so, then refill it to check how much you've actually used, than use the OBC, just in case the gauge isn't calibrated the same.
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  6. Mr_Sixx
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    Mr_Sixx Stationary

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    [Feb 10, 2014]
    I bought my A3 170 TDi S Line (Sportsback) about three weeks ago, Im getting between 50 to 65mpg (or ~220 miles on £30 of diesel) but I couldn't say how much on a tank of fuel, not brimmed it yet!
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  7. ahtcap
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    ahtcap Member

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    [Feb 10, 2014]
    Does your DIS not have two readings?One for present journey and one for overall.
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  8. c_w
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    c_w Well-Known Member

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    [Feb 10, 2014]
    Should be on Computer 2 for long term readings. Computer 1 is single journey figures (cycle through the Comp1,2, Speed, Menu etc using the button under the right stalk).



    I can't be anywhere near 65mpg, the 170 generally won't do that as realistically your average is about 47mpg based on £30 over 220miles, assuming diesel is £1,40/litre.
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  9. ahtcap
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    ahtcap Member

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    [Feb 10, 2014]
    Thirty pounds of fuel would roughly be 4.9 gallons this would be 45 mpg approx!
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  10. Mr_Sixx
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    Mr_Sixx Stationary

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    [Feb 10, 2014]
    Ahh I'll set it to computer 2 & see what it tells me!

    On payday I'll brim the tank and see what it does properly & report back..Im paying £1.34 per litre
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  11. ahtcap
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    ahtcap Member

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    [Feb 10, 2014]
    My sportback shows 55mpg on computer 2 but i only achieve 45mpg thats brim to brim on the tank.
    #10
  12. dannyh1991uk
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    dannyh1991uk Member

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    [Feb 11, 2014]
    I have 2.0 tdi 140 manual and half a tank is about 250ish miles... Mixed motorway and town driving... Bit of heavy foot for a bit of fun ;)
    #11
  13. Phil-1
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    Phil-1 Well-Known Member

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    [Feb 11, 2014]
    In my 2.0l TDI I'm getting 30 mpg around town and on a run it' about 45 mpg from memory.
    #12
  14. J8TT X
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    J8TT X Member

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    [Feb 11, 2014]
    £40 gets me 200 miles. Mostly town driving.
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  15. A3Kent
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    A3Kent Different Gear

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    [Feb 11, 2014]
    A full tank (£75) gets me 500 miles maybe 510. Always has done since I got it. I don't do that many motorway journeys either.

    09 170 TDI.
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  16. fangio
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    fangio Well-Known Member

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    [Feb 11, 2014]
    140 Tdi Dsg, averages 45 every brim to brim, never been near a motorway, mostly town and back lanes over t' moors.

    Doesn't often get into 6th gear!
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  17. a3Tex
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    a3Tex New Member

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    [Feb 11, 2014]
    Haha yeah I knew what you meant. Presuming you didn't have the DIS in the old car?

    Something is obviously up, I have the 2.0L 170 and even if I drive it like a chav (which, for my shame, I almost always do) I still easily get 50+ MPG.

    One thing I would suggest is that the is the fuel pump might be stopping early, it might be looking "full" on the fuel gauge but not actually full full. I had this in a car of mine, I ran it to virtually empty (the 'oh **** oh **** where is a petrol station phase'), filled it up and it clicked at 40 litres which I thought was weird in a 45L tank. Pressed it again and it carried on up to 44.1. Do the fill to the brim, drive 200 miles and refuel strategy mentioned above.
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  18. fangio
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    fangio Well-Known Member

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    [Feb 11, 2014]
    You aren't supposed to put more fuel in after the pump clicks off. From the handbook:-

    "Do not try to put in more fuel after the nozzle cuts out, as this will fill the expansion chamber in the fuel tank."
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  19. a3Tex
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    a3Tex New Member

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    [Feb 11, 2014]
    Obviously but if the fuel pump is cutting off early...
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  20. john_e
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    john_e New Member

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    [Feb 11, 2014]
    Thanks for the feedback everyone. I'll brim the tank tomorrow and see what the calculator says. :)
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  21. madmanrsvr
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    madmanrsvr Member

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    [Feb 11, 2014]
    i have the 57 plate tdi 140 and and the best i can get is 42mpg if i drive like an old man and thats going by working it out from how much i put at the pumps as my computer allways says i am doing 48mpg,i have just had a stage 1 remap and still the same but a lot more fun,
    i have never got over 42 mpg and never 500 miles on a full tank
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  22. fangio
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    fangio Well-Known Member

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    [Feb 11, 2014]

    How would you know? :uhm:
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  23. dannyh1991uk
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    dannyh1991uk Member

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    [Feb 11, 2014]
    My overall computer is on 42mpg... But going to work and back is about 3miles stop/start in traffic... And often go on motorway to visit people...with a bit of a heavy foot ;)
    I do use Shell V-Power though.
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  24. sje00
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    sje00 Member

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    [Feb 12, 2014]
    i have an 04 2.0 tdi 140 and i'm averaging about 42-43mpg overall. with a stage one remap. I'm gonna try a full service and see if it makes any difference.

    I try to use super diesel and use the Fuel system cleaner stuff too.
    #23
  25. madmanrsvr
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    madmanrsvr Member

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    [Feb 12, 2014]
    you will have to let us no if it makes a difference to your mpg as if that works i will book mine in as i have not had it very long,i bought it from a garage but i dont think they done a full service ie. fuel filter as i have been told this makes a difference.

    keep us informed
    #24
  26. a3Tex
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    a3Tex New Member

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    [Feb 12, 2014]
    I didn't for about 2 years. Wasn't until I drove until the fuel light had come on, filled up the tank and saw the amount I put it was less than the tank size - fuel left.

    I don't know why it was triggering the fuel pump to stop early, something must have been affecting the hole in the pump which cuts off the supply. It would sometimes do it even if the tank was only half full so it was obviously a design fault of some kind.

    If you are basing a calculation on how many miles you've done before you get to a quarter tank. The key relevant bit of information is ensuring that the fuel start point isn't different.
    #25
  27. fangio
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    fangio Well-Known Member

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    [Feb 12, 2014]

    True, but if you use the same cut -off point every time, then you should get an accurate reading. Do you always use the same garage and pump? If not, get Audi to take a look down your filler pipe. I use several different garages with standard fuel and get consistent results. I fill to the first click then up to the next £.

    I never, ever use supermarket fuel; I used to deliver it!!!
    #26

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